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DNA-Encoded Gold-Gold Wettability for Programmable Plasmonic Engineering.

Tingting Zhai1, Haoran Zheng1, Weina Fang2

  • 1School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules and National Center for Translational Medicine, Shanghai Jiao Tong University, Shanghai, 200240, PR China.

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Summary

Single-stranded DNA (oligo-adenine) controls gold adatom wettability, enabling tunable synthesis of unique plasmonic nanostructures. This DNA-mediated approach engineers nanocrystal shape and function for advanced optical devices.

Keywords:
Adsorbed AtomsGold-Gold WettabilityNanocrystal SynthesisOligo-AdeninePlasmonics

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • Controlling adatom deposition and diffusion is crucial for nanocrystal engineering.
  • DNA's role in directing nanomaterial growth is an emerging area of research.

Purpose of the Study:

  • To investigate the use of oligo-adenine (oligo-A) to tune nanocrystal wettability and growth modes.
  • To synthesize highly tunable plasmonic nanostructures using DNA-guided growth.
  • To engineer nanoparticles with controlled curvature and dimensions for plasmonic applications.

Main Methods:

  • Utilizing single-stranded DNA (oligo-adenine) to modify gold seed wettability for gold adatoms.
  • Employing DNA density control to adjust the gold-gold contact angle (θ).
  • Synthesizing plasmonic nanostructures with varying curvatures and dimensions.

Main Results:

  • Oligo-A attachment shifted nanocrystal growth from Frank-van der Merwe to Volmer-Weber island growth.
  • Continuous tuning of the gold-gold contact angle (θ) from 35.1±3.6° to 125.3±8.0° was achieved by adjusting oligo-A density.
  • A sub-nanometer plasmonic cavity with a geometrical singularity was synthesized for θ>90°.
  • Superfocusing of light and near-infrared intraparticle plasmonic coupling were observed.

Conclusions:

  • Oligo-adenine provides a versatile method to control nanocrystal growth and wettability.
  • This strategy enables the synthesis of precisely engineered plasmonic nanostructures.
  • The developed technique offers a pathway for surface engineering of single-particle plasmonic devices.